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IMPROVEMENT IN STOP-COURS.

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TO ALL WHOM IT MAY CONCERN: v

Be it known that I, Z. ERAsTUs COFFIN, of Boston, in the county ofSuffolk, and Newton, in the county of Middlesex, and State ofMassachusetts, have-invented certain new and useful Improvements inStop-Cocks for water pipes; and I do hereby declare that the followingis a full and exact description thereof, reference being had to theaccompanying drawings, and to the letters of reference marked thereon.These drawingsform a part of this specification.

Figure 1 is a sectional and internal view, one side being removed toshow the valve and slides. I

Figure 2 is also a sectional view taken transversely to the first, andalso showing the edge view of the Valve, a part of one slide or guide, Jand C. I

Figure 3 is a section at line A of the shell and line B of the valve.

Figure 4 shows the screws for operating the valve, with theirlconnecting gears arranged for operating horizontally` Like lettersindicate the same or corresponding parts in all the figures or drawings.

a b c and d are the four separate partsv of the shell or body of thecock. e is the valve, having the two faces,f, itting, when the cock isclosed, to the seats g. The valve, when the cock is open for the passageof water, die., is drawn, as shown in gs. I and 2, into the chamber t.The valve e is furnished with bearings, t', on each side, to bear onslides or guides, J, for its guidance. These guides dare' different fromothers used heretofore, in that they are made separately from the shellor body of the cock, and in one continuous piece, and

afterward adjusted and fastened by screws or otherwise, within the shellor body, and not cast in or formed upon one or more sections of theshell. By this modeof construction the slides or guides are easily madeand conveniently adjusted. The diiculty of planing up lche slides withinthe shell is avoided, and an additional tie furnished for securing theseveral sections together. Also the liability of different sections of aguide made on the different sections ofthe cock to get out of line isavoided by this making of the Aslides separately and in one piece, andfastening them in. To effect the movement of the valve to and from itsseats, it is furnished with two screws, 7c, arranged parallel to eachother, and having their bearing in the shell or upon it. And the valveis furnished with nuts, Z, for these screws to work in.V `This order,however, may be reversed',lthe screw being connected to the valve, andthe nut to the shell and gears. The screws are connected together so asto operate simultaneously andvequally by gears, as shown in fig. l, oras shown in fig. 4, orotherwise, as by chainwheels, hand-wheels, &c.This insures the equal movement of the whole body of the valve, howevermuch greater the friction orother resistance fmay be on one side than onthe other. This is also particularly advantageous in the caseof thetaper valve, as it insures its seating properlygand equally. When thebevel-gears are arranged asin fig. 4, the screws must be right and'left-threaded, though the small bev'el-wheelsmay both be arranged in thesame relation-to the large ones, iuvwhich case-the screws may bethreaded alike. In other particulars than those specified thesestop-cocks do not differ materially, either inconstruction or materials,from such as are well known to the art.

Thus having described my improvements, what I claim as my invention, anddesire to secure by Letters'- Iatent, is as follows:

I am aware-that the mere multiplication of parts is not my invention;but it will be perceived that whether' my gate is pendent or horizontal,the steady direction of it inline with vits guides cannot be secured bya single 'central screw, nor by several screws, except when operated' bya system of gearing of simultaneous action. I therefore claim the tapervalve operated by connected screws, and moving on continuous guidesarranged within the shell or body of a stop-cock, substantially asdescribed.

1 Z. E. COFFIN.

lVitnesses: n

EDWARD REED, D. N. B. CorrrN, Jr.

